How to Modify the language of the default mailbox folders

By default, the names of the default folders will match the language of Outlook. However, if you have been using a different language of Outlook before when these folders were created, you’ll have to reset the folders to match the language of Outlook again by starting Outlook with the /resetfoldernames switch.

Windows 10
Start-> type; outlook.exe /resetfoldernames
(you can also type this directly in the Cortana Search box in the Taskbar)

Windows 8
Start Screen-> type; outlook.exe /resetfoldernames
As soon as you start typing, a search box will automatically appear.

Windows Vista and Windows 7
Start-> type; outlook.exe /resetfoldernames

Windows XP and previous
Start-> Run; outlook.exe /resetfoldernames

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